Onstar is behind the glove box. Are you going to use the new unit for sound or just video? You will have a very difficult time retaining the oem head unit and adding a second head unit to share the same amp/speakers and don't forget about the databus.
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\'05 Slate Blue Sut w/ Magnusun, JBA headers, custom exhaust, 22\" MC2 RT5 wheels, Pioneer AVIC Z1 nav, Passport SRX, Vizualogic A1000 dual, bi xenons, fog xenons, dual optimas, and just gettin\' started!
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